Calculation of the thermal compensation of Hall transducers with thin indium antimonide films

Conclusions

• 1. In feeding indium antimonide thin-film Hall transducers from sources with a small internal resistance it is advisable to use a series thermal compensation circuit consisting of resistances which vary linearly with temperature.

• 2. A thermal compensation precision suitable for practical purposes over an adequately wide temperature range can be obtained with thermal resistances which have positive and negative coefficients.

• 3. The thermal compensation circuit is very simple and can be easily calculated.

• 4. The power loss in the thermal compensation circuit is very small.

• 5. The maximum residual error m_max can be reduced substantially by selecting a thermal compensation material with a temperature coefficient α_σ for which function m_max=f(α _s) intersects the axis of abscissas (for instance, in the case under consideration α_σ=−1%/°C). The required values of α_σ and$r_{\delta _{20} }$ can be easily obtained by combining thermistors with temperature-stable resistances according to the technique described in [4, 5].